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Centuries: 16th century - 17th century - 18th century

Decades: 1620s 1630s 1640s 1650s 1660s - 1670s - 1680s 1690s 1700s 1710s 1720s

Years: 1666 1667 1668 1669 1670 - 1671 - 1672 1673 1674 1675 1676




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Axiom of pairing

... is: Given any finite number of sets A1 through An, there is a set C whose members are precisely A1 through An. This set C is again unique by the axiom of extension, and ...